/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SNiagaraHierarchy.h
[FReply](API\Runtime\SlateCore\Input\FReply) OnDroppedOn ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) &, const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & DragDropEvent, EItemDropZone DropZone ) const